dependabot-update

Why these changes are being introduced:
* Setting dependabot pip updates to weekly to reduce volume of PR emails

How this addresses that need:
* Update dependabot.yml to set pip updates to weekly

Side effects of this change:
* None

Relevant ticket(s):
* NA

Author: ehanson8

.github/dependabot.yml

@@ -15,7 +15,7 @@ updates:
   - package-ecosystem: "pip"
     directory: "/"
     schedule:
-      interval: "daily"
+      interval: "weekly"
     reviewers:
       - "MITLibraries/dataeng"